Knockdown scaffold.



A. GILLILAND.

KNOGKDOWN SGAFFOLD.

APPLICATION FILED AUG. 25, 1909.

964,233.. Patented July 12,1910.

ALEXANDER GILLILAND, 01

BELLEVUE, PENNSYLVANIA.

KNOCIEIDUWN SCAFFOLD.

"Application filed August 25, 1909. Serial No. 514,520.

To all when it may concern:

Be it known that I, ALEXANDER GILLI- LAND, of Bellevue, Allegheny county, Pennsylvania, have invente a new and useful Improvement in Knockdown Scatlolds, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in .which- Figure 1 is a plan view partially in section of one form of my improved scaffold; Fig. 2 is a side elevation of the same with parts broken away; Fig. 3 is a perspective view of one of the angle iron sections, showing the offset tie rod plate secured thereto, and Fig. 4 is a perspective view of the end of one of the sections of the uprights.

This invention relates to sectional knockdown scaffolds, and is designed to provide a scaffold of this character which is cheap in construction, and which can readily be erected and taken down without waste of material.

A further and more specific object is to provide a scafiold which may readily be erected in the interior of a stack, and which can be taken apart and removed therefrom when the work for which it has been erected has been completed. Also to provide a scaffold of this character in which the parts can be readily changed for use in stacks of different diameters. Also to provide a seatfold of this character which can be erected without the use of bolts or screws.

My invention consists of uprights or columns built up of short sections of angle iron, or other suitably shaped sections, each of which is provided with a socket atone end to receive the end of the next section. Some or all of these sections are provided with sockets to receive the ends of tie bars to connect the sections of one upright to the sections of an adjacent upright.

The precise nature of my invention will be best understood by reference to the accompanymg drawings, which will now be described, it being premised, however, that various changes may be made in the details of the construction and eneral arrangement of the parts without eparting from the spirit and scope of my invention, as defined in the appended claims.

In the drawings, the numeral 2 designates the uprights, each of which is composed of, or built up, of a plurality of short sections '3 of angle iron. Secured to the outer fee of the upper end of each of these sections is a short angle plate 4, and secured to the inner face of the u per end of both of the members of the ang e iron 3 is a short plate 5. As illustrated in the drawings the plates 4 and 5 are secured to the upper end of the sections 3 by means of through rivets which pass through the bars 3, and plates 4 and 5. Secured to the outer face of the sections 3 is an ofi'set angle plate 6, the oifset forming a socket 7, which is designed to receive the downwardly projecting end of a hook 8, secured to a tie bar 9. The other end of this tie bar 9 is also provided with a similar hook 8, which engages a socket 7 in the oilset plate 6 which is secured to the outer face of one of the sections of the adjacent upright. These tie bars may be of any suitable length to meet the requirements for which the scattold is erected, and can be readily cut to the desired lengths.

When it is desired to erect the scafl'old, the first sections 3 of each of the columns are placed on'a suitable support, and are tied together by means of the tie bars 9. The ends of the second sections 3 of the columns are inserted into the sockets on the ends of the first sections which are formed by the plates 4 and 5. These sections are then tied to gether .by means of similar tie bars 9; the

above this second section in a similar manner. The succeeding sections are built one upon the other until the scaffold has been erected to the desired height. In this construction no bolts or screws are necessary, so

strongly built.

After the work has been completed for which this scaffold has been erected, the scaffold may readily be dismantled, by beginning at the top, and lowering section after section to the ground.

Heretofore scafiolds of this character have been built of lumber, which was usually split and broken when the scaffold was taken down, thereby causing a great loss in lumber, and consequently a financial loss to the builder.

It will be readily understood by those skilled in the art that various changes may be made in'the design of the ofiset plates or in the construction of the socket at the end of the sections. It will also be understood third section of the scafiold is then placedthat the structure can be very quickly yet that these sections which form the uprights might also be made of a different cross section than that illustrated in the drawings.

The advantages of my invention result I from the provision of a scaffold which can be cheaply and easily constructed from rolled shapes, and which can readily be taken down and the material again used.

I claim:

1. A knockdown scaffold comprising uprights formed of :1V plurality of angular sections, each section having an socket at the end thereof'formed of an angle plate secured to one face of the angular section and two plates secured to the other face of the section to receive the end of an adjacent section,.sockets formed on the outer face of each of the sections, and removable members engaging the sockets on the sections of two uprights to tie them together; substantially as described.

A knockdown scaffold com' rising up rights formed of a pl lrality of angle sections, each section hading a socket at one end to receive the end of an adjacent section, an offset angle plate secured to the outer face of each angle section, and a tie bar having projections adapted to engage the ofl'set in the angle plate of sections in adjacent uprights; substantially as described.

In testimony whereof, I have hereunto set my hand.

ALEXANDER GILLILAND. lVitnesses GEO. B. BLEMING, R. A. BALDERSON. 

